Rotating endless screen belt for the mechanical purification of water



May 24 1927.

E. GElGER ROTATING ENDLESS SCREEN BELT FOR THE MECHANICAL PURIFICATION 0F WATER Filed March 25;l 1926 2 sheets-sheet 2 /NV'ENTUR Patented May 24,1927. y.

linnrln; STATES,

PATENT. osi-Ice Enormiy GEIGER, or KARLSRUHE, (inni/Uilm.v

RQTATING ENDLEss SCREEN' isnnrron 'THE MEor-IANroAL PURIFI'CATION or WATER.

Application filed March'z, `1926, Serial N'o. 97,395, and in .Germany April?, 1925. i

j My invention relates to screens for mechanically purifying river or waste water, which are in the torni of an endless belt composed of a number of sections of screen held in frames and rotated by twoV endless chains whichare disposed one at each side Vand whichy are guided in two U-shaped rails mounted'on the side walls of the water channel by means of rollers that are mounted on pins formed by the ends of the bolts connecting the chaiulinks, the chains being driven above the water by two Vwheels mounted upon a' common shaft and provided with a number' ofv peripheral gaps engaged by the guiding rollers running'over them.

The invention especially relates to screen belts of that kind in which the said trames are pivotally suspended from the chain bolts and, in order to scrape off floating and suspended substancesrlil'ted out of the water by means of transverse bars provided at the pivoted end of the frames and to throw these substances into a trough arranged in front of the upper port-ion of the frontl part of the belt by means of the frames, these are caused to swing out forwards and vafter said operation allowed to swing back.

In known screen vbelts of this kind the sliding friction of thev guiding rollers in the ygaps of the chain wheels acts to check the rotation of the chain bolts so as to .impede the said movement of the frames. To avoid this, according to my invention the chain wheels are provided at their gaps, which are correspondingly enlarged, with bearing rollers projecting into the gaps so thatthe guiding rollers of the belt engaging with the gaps come to rest upon said bearing rollers and consequently run over the chain wheels no longer with sliding but with rolling friction, thus securing an easy movement of the :trames as well as `an easy and quiet running of the belt.

In the accompanying drawings Fig. l shows the upper part of an endless screen belt in vertical section with a chain wheel embodying my invention in side elevation, and Figs. 2 and 3 show a part of the chain wheel with a guiding roller engaging therewith on a larger scale in side elevation and in cross section respectively. a

The endless screen belt, Fig.l Y1i, is composed of a number of screen sections l which are held in frames 2. These frames are carried by two endless chains 3 which are disposed on both sides of the belt. The links of these chains are connected together by horizontal bolts l both ends of which Iform a bearing pin carrying a 'roller a.' -The chains 3 are by means of these rollers guided 'in two J-sha'ped rails 5 mounted o n 'the lside walls 6 ot' the water channeland are gaged by the rollers i running'y over the wheel. n

Furthermore, the rim of the chain wheels 7 has'adjacent to each gap 9Vthree smaller circular gaps l()y the ucenters Vof which l'lie ona circle concentric with the gap 9. In each gap l0 there is a roller I) rotatably mounted on a bolt l1. These bolts rest at one end in therim of the wheel 7 and at the other end in a plate 12 secured to the inner tace of the rim by means of screws. The rollers Z) project somewhat into the gap 9 the radius of which is somewhat larger than that of the roller t so that the latter in engaging with the gap 9 comes to rest upon the rollers b at a corresponding distance from the face ofthe gap.

On the outer face of the rim of the wheel 7 Vthere is secured by vmeans of screw bolts a spur gear rim I3 serving for the drive of the belt. l

lVhat I claim as my invention and desire to secure by Letters Patent is: f

l. In a rotating endless screen belt for the mechanical purification otwater, in combination with two endless chains carrying saidA belt and guiding rollers on both sides and running over two chain wheels mounted above the water, a number of gaps provided in the periphery of the rim of said chain wheels for the engagement of said guiding rollers', the radius ot' said gaps being somewhat larger than that of said rollers, and a number of ybearing rollers rotatably mounted in the rim of said chain Wheels adjacent to each of said' gaps and with their periphery somewhat projecting into the respective gap so'that said guiding rollers in engaging with said gaps come to rest upon said bearing rollers at a certain distance from the ,tace of the respective gap;

2. In a rotating endless screen belt for the mechanical puriiication of water, in combination with two endless chains carrying said belt and guiding rollers on both sides and running over two chain wheels mounted above the water, a number of gaps provided in the periphery of the rim of said chain wheels tor the engagement of said guiding rollers, the radius ot said gaps being somewhat larger than that ot' said rollers, a number' oi' further gaps provided in the rim'of said chain wheels adjacent to each of the first said gaps, and a number oil bearing rollers one ot' which being rotatably mounted in each of said further gaps so that its periphery7 projects somewhat into the respective first said gap and that said guiding rollers in engaging with the first said gaps come to rest upon said bearing rollers at a certain distance from the 'tace ot the respee tive gap. j

3. ln a rotating endless screen belt iior the mechanical purification ot water, in combination with two endless Chains carrying said belt and guiding rollers on both sides and running over two chain wheels mounted above the water, a number oi1 gaps provided in the periphery of the rim ot said chain wheels for the engagement oi said guiding rollers, the radius of said gaps being somewhat larger than that of said rollers, a number oil further gaps provided 1n the rim of said chain wheels adjacent to each ot the first said gaps, a number' of plates secured to the rim et saidv chain wheels adjacent to each of the iirs't saidvgaps and laterally Closing the respective further gaps, a number ot' urther bolts extending through said gaps and resting in the rim of said chain Wheels and in said plates, and a number ot' bearing rollers one of which being rotatably mounted in each of said gaps upon the respective further bolt so thatits periphery projects somewhat into the respective first said gap and vthat said guiding rollers in engaging with the irst said gaps come to .rest upon said bearing rollers at a (certain distance trom the tace of the respective lgap.

1n testimony whereotl I'aliix my s1gna ture.

DR. EUGEN GEIGER.

CII 

